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<h1 id="plotMapLayerType">PlotMapLayer</h1><p>
Defines the content of a map of <a class="groops-program" href="PlotMap.html">PlotMap</a>. Multiple layers are are plotted sequentially.
</p>

<h2>GriddedData</h2><p>
Creates a regular grid of yxz values. The standard <a class="groops-ref" href="general.parser.html#dataVariables">dataVariables</a>
are available to select the data column of <a class="groops-class" href="fileFormat_griddedData.html">inputfileGriddedData</a>.
Empty grid cells are not plotted. Cells with more than one value will be set to the mean value.
The grid spacing can be determined automatically for regular rectangular grids otherwise
it must be set with <strong class="groops-config-element">increment</strong>. To get a better display together with some projections
the grid should be internally <strong class="groops-config-element">resample</strong>d to higher resolution.
It is assumed that the points of <a class="groops-class" href="fileFormat_griddedData.html">inputfileGriddedData</a> represents centers of grid cells.
This assumption can be changed with <strong class="groops-config-element">gridlineRegistered</strong> (e.g if the data starts at the north pole).
</p>
<table class="table table-hover">
<tr class="table-primary"><th>Name</th><th>Type</th><th>Annotation</th></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config mustset">inputfileGriddedData</div></div></td><td>filename</td><td></td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config mustset">value</div></div></td><td>expression</td><td>expression to compute values (input columns are named data0, data1, ...)</td></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config optional">increment</div></div></td><td>angle</td><td>the grid spacing [degrees]</td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config optional">illuminate</div></div></td><td>boolean</td><td>illuminate grid</td></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config optional">resample</div></div></td><td>sequence</td><td></td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-1"><div class="h-100 config optional">intermediateDpi</div></div></td><td>double</td><td>oversample grid for a smoother visual effect</td></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-1"><div class="h-100 config mustset">interpolationMethod</div></div></td><td>choice</td><td>interpolation method for oversampling</td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-2"><div class="h-100 config mustset">bspline</div></div></td><td></td><td>B-Spline interpolation</td></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-2"><div class="h-100 config mustset">bicubic</div></div></td><td></td><td>bicubic interpolation</td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-2"><div class="h-100 config mustset">bilinear</div></div></td><td></td><td>bilinear interpolation</td></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-2"><div class="h-100 config mustset">nearest</div></div></td><td></td><td>nearest neighbour interpolation</td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-1"><div class="h-100 config optional">threshold</div></div></td><td>double</td><td>A threshold of 1.0 requires all (4 or 16) nodes involved in interpolation to be non-NaN. 0.5 will interpolate about half way from a non-NaN value; 0.1 will go about 90% of the way.</td></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config optional">gridlineRegistered</div></div></td><td>boolean</td><td>treat input as point values instead of cell means</td></tr>
</table>

<h2 id="points">Points</h2><p>
Draws points (<a class="groops-class" href="plotSymbolType.html">symbol</a>) and/or <a class="groops-class" href="plotLineType.html">line</a>s
between the points. If no <a class="groops-class" href="plotColorType.html">color</a> of the <a class="groops-class" href="plotSymbolType.html">symbol</a>
is given a <a class="groops-class" href="plotColorbarType.html">colorbar</a> is required and the color is determined
by the <strong class="groops-config-element">value</strong> expression. The standard <a class="groops-ref" href="general.parser.html#dataVariables">dataVariables</a>
are available to select the data column of <a class="groops-class" href="fileFormat_griddedData.html">inputfileGriddedData</a>.
</p>
<table class="table table-hover">
<tr class="table-primary"><th>Name</th><th>Type</th><th>Annotation</th></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config mustset">inputfileGriddedData</div></div></td><td>filename</td><td></td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config optional">value</div></div></td><td>expression</td><td>expression to compute color (input columns are named data0, data1, ...)</td></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config optional">symbol</div></div></td><td><a href="plotSymbolType.html">plotSymbol</a></td><td></td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config optional">line</div></div></td><td><a href="plotLineType.html">plotLine</a></td><td>style of connecting lines</td></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config optional">drawLineAsGreatCircle</div></div></td><td>boolean</td><td>draw connecting lines as great circles (otherwise, a straight line is drawn instead)</td></tr>
</table>

<h2>Arrows</h2><p>
Draws an arrow for each point in <a class="groops-class" href="fileFormat_griddedData.html">inputfileGriddedData</a>.
The arrows are defined by the expressions <strong class="groops-config-element">valueNorth/East</strong>.
The standard <a class="groops-ref" href="general.parser.html#dataVariables">dataVariables</a>
are available to select the correspondent data columns of <a class="groops-class" href="fileFormat_griddedData.html">inputfileGriddedData</a>.
The <strong class="groops-config-element">scale</strong> factor converts the input units to cm in the plot.
If no <a class="groops-class" href="plotColorType.html">color</a> is given a <a class="groops-class" href="plotColorbarType.html">colorbar</a> is required
and the color is determined by the <strong class="groops-config-element">value</strong> expression.
With <strong class="groops-config-element">scaleArrow</strong> a reference arrow as legend can be plotted inside or outside the map.
</p>
<table class="table table-hover">
<tr class="table-primary"><th>Name</th><th>Type</th><th>Annotation</th></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config mustset">inputfileGriddedData</div></div></td><td>filename</td><td>grid file with north and east values for arrows</td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config mustset">valueNorth</div></div></td><td>expression</td><td>expression to compute north values (input columns are named data0, data1, ...)</td></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config mustset">valueEast</div></div></td><td>expression</td><td>expression to compute east values (input columns are named data0, data1, ...)</td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config optional">value</div></div></td><td>expression</td><td>expression to compute arrow color (input columns are named data0, data1, ...)</td></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config optional">scale</div></div></td><td>double</td><td>[cm per input unit] length scale factor</td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config mustset">penSize</div></div></td><td>double</td><td>[pt] width of arrow shaft</td></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config mustset">headSize</div></div></td><td>double</td><td>[pt] size of arrow head, 0: no head, negative: reverse head</td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config optional">color</div></div></td><td><a href="plotColorType.html">plotColor</a></td><td>empty: from value</td></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config optional">scaleArrow</div></div></td><td>sequence</td><td>draw an arrow for scale reference</td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-1"><div class="h-100 config mustset">originX</div></div></td><td>double</td><td>[0-1] 0: left, 1: right</td></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-1"><div class="h-100 config mustset">originY</div></div></td><td>double</td><td>[0-1] 0: bottom, 1: top</td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-1"><div class="h-100 config mustset">length</div></div></td><td>double</td><td>in same unit as valueNorth and valueEast</td></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-1"><div class="h-100 config mustset">unit</div></div></td><td>string</td><td>displayed unit text (e.g. 1 cm)</td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-1"><div class="h-100 config optional">label</div></div></td><td>string</td><td>description of the arrows</td></tr>
</table>

<h2>Polygon</h2><p>
Draws a <a class="groops-class" href="fileFormat_polygon.html">inputfilePolygon</a>.
If <a class="groops-class" href="plotColorType.html">fillColor</a> is not set and a <strong class="groops-config-element">value</strong>
is given the fill color is taken from a <a class="groops-class" href="plotColorbarType.html">colorbar</a>.
</p>
<table class="table table-hover">
<tr class="table-primary"><th>Name</th><th>Type</th><th>Annotation</th></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config mustset">inputfilePolygon</div></div></td><td>filename</td><td></td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config optional">line</div></div></td><td><a href="plotLineType.html">plotLine</a></td><td>style of border lines</td></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config optional">fillColor</div></div></td><td><a href="plotColorType.html">plotColor</a></td><td>polygon fill color (no fill color: determine from value if given, else: no fill)</td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config optional">value</div></div></td><td>double</td><td>value to compute fill color from a colorbar (ignored if a fillColor is given)</td></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config optional">drawLineAsGreatCircle</div></div></td><td>boolean</td><td>draw connecting lines as great circles (otherwise, a straight line is drawn instead)</td></tr>
</table>

<h2>Coast</h2><p>
Plots coastlines. GMT provides them in different <strong class="groops-config-element">resolution</strong>s.
Features with an area smaller than <strong class="groops-config-element">minArea</strong> in $km^2$ will not be plotted.
</p>
<table class="table table-hover">
<tr class="table-primary"><th>Name</th><th>Type</th><th>Annotation</th></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config mustset">resolution</div></div></td><td>choice</td><td></td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-1"><div class="h-100 config mustset">crude</div></div></td><td></td><td></td></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-1"><div class="h-100 config mustset">low</div></div></td><td></td><td></td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-1"><div class="h-100 config mustset">medium</div></div></td><td></td><td></td></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-1"><div class="h-100 config mustset">high</div></div></td><td></td><td></td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-1"><div class="h-100 config mustset">full</div></div></td><td></td><td></td></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config optional">line</div></div></td><td><a href="plotLineType.html">plotLine</a></td><td>line style for coastlines</td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config optional">landColor</div></div></td><td><a href="plotColorType.html">plotColor</a></td><td>fill land area</td></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config optional">oceanColor</div></div></td><td><a href="plotColorType.html">plotColor</a></td><td>fill ocean area</td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config optional">minArea</div></div></td><td>uint</td><td>[km^2] features with a smaller area than this are dropped</td></tr>
</table>

<h2>Rivers</h2><p>
Plots rivers and lakes. GMT provides different classes
(<a href="https://docs.generic-mapping-tools.org/latest/coast.html" target="_blank">https://docs.generic-mapping-tools.org/latest/coast.html</a>).
</p>
<table class="table table-hover">
<tr class="table-primary"><th>Name</th><th>Type</th><th>Annotation</th></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config mustset">class</div></div></td><td>choice</td><td></td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-1"><div class="h-100 config mustset">riversCanalsLakes</div></div></td><td></td><td></td></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-1"><div class="h-100 config mustset">riversCanals</div></div></td><td></td><td></td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-1"><div class="h-100 config mustset">permanentRiversLakes</div></div></td><td></td><td></td></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-1"><div class="h-100 config mustset">permanentRivers</div></div></td><td></td><td></td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-1"><div class="h-100 config mustset">intermittentRivers</div></div></td><td></td><td></td></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-1"><div class="h-100 config mustset">canals</div></div></td><td></td><td></td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-1"><div class="h-100 config mustset">singleClass</div></div></td><td>sequence</td><td></td></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-2"><div class="h-100 config mustset-unbounded">class</div></div></td><td>uint</td><td>0-10. See GMT documentation</td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config mustset">line</div></div></td><td><a href="plotLineType.html">plotLine</a></td><td></td></tr>
</table>

<h2>PoliticalBoundary</h2><p>
Plots national boundaries. GMT provides them in different <strong class="groops-config-element">resolution</strong>s.
</p>
<table class="table table-hover">
<tr class="table-primary"><th>Name</th><th>Type</th><th>Annotation</th></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config mustset">resolution</div></div></td><td>choice</td><td></td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-1"><div class="h-100 config mustset">crude</div></div></td><td></td><td></td></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-1"><div class="h-100 config mustset">low</div></div></td><td></td><td></td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-1"><div class="h-100 config mustset">medium</div></div></td><td></td><td></td></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-1"><div class="h-100 config mustset">high</div></div></td><td></td><td></td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-1"><div class="h-100 config mustset">full</div></div></td><td></td><td></td></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config mustset">line</div></div></td><td><a href="plotLineType.html">plotLine</a></td><td></td></tr>
</table>

<h2>BlueMarble</h2><p>
An image of the Earth's surface as seen from outer space -
the image is known as <em>blue marble</em>. The directory of <strong class="groops-config-element">inputfileChannels</strong>
contains several files in different resolutions representing the Earth's surface each
month throughout a year.</p><p><figure><img class="figure" style="width:80%;" src="../figures/blueMarble.png" alt="blueMarble"><figcaption class="center">Figure: The blue marble.</figcaption></figure>
</p>
<table class="table table-hover">
<tr class="table-primary"><th>Name</th><th>Type</th><th>Annotation</th></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config mustset">inputfileImage</div></div></td><td>filename</td><td>Blue Marble image file</td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config optional">brightness</div></div></td><td>double</td><td>brightness of bitmap [-1, 1]</td></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config optional">illuminate</div></div></td><td>sequence</td><td>add hillshade based on topography</td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-1"><div class="h-100 config mustset">inputfileTopography</div></div></td><td>filename</td><td>GMT grid file containing topography.</td></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-1"><div class="h-100 config optional">azimuth</div></div></td><td>angle</td><td>direction of lighting source [deg]</td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-1"><div class="h-100 config optional">elevation</div></div></td><td>angle</td><td>direction of lighting source [deg]</td></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-1"><div class="h-100 config optional">ambient</div></div></td><td>double</td><td>ambient lighting</td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-1"><div class="h-100 config optional">diffuse</div></div></td><td>double</td><td>diffuse lighting</td></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-1"><div class="h-100 config optional">specular</div></div></td><td>double</td><td>specular reflection</td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-1"><div class="h-100 config optional">shine</div></div></td><td>double</td><td>surface shine</td></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-1"><div class="h-100 config optional">amplitude</div></div></td><td>double</td><td>scale gradient by factor</td></tr>
</table>

<h2>Text</h2><p>
Writes a <strong class="groops-config-element">text</strong> at <strong class="groops-config-element">originLongitude</strong> and <strong class="groops-config-element">originLatitude</strong> position in the map.
With <strong class="groops-config-element">clip</strong> the text is cutted at the boundaries of the plotting area.
</p>
<table class="table table-hover">
<tr class="table-primary"><th>Name</th><th>Type</th><th>Annotation</th></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config mustset">text</div></div></td><td>string</td><td></td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config mustset">originLongitude</div></div></td><td>angle</td><td>[deg]</td></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config mustset">originLatitude</div></div></td><td>angle</td><td>[deg]</td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config optional">offsetX</div></div></td><td>double</td><td>[cm] x-offset from origin</td></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config optional">offsetY</div></div></td><td>double</td><td>[cm] y-offset from origin</td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config optional">alignment</div></div></td><td>string</td><td>L, C, R (left, center, right) and T, M, B (top, middle, bottom)</td></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config optional">fontSize</div></div></td><td>double</td><td></td></tr>
<tr class=""><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config mustset">fontColor</div></div></td><td><a href="plotColorType.html">plotColor</a></td><td></td></tr>
<tr class="table-light"><td class="m-0"><div class="h-100 config-tree depth-0"><div class="h-100 config optional">clip</div></div></td><td>boolean</td><td>clip at boundaries</td></tr>
</table>

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